Turbine casing



Oct.- 25, 193-2. J. B. WALBRlDGE I 1,834,422

TURBINE CAS ING Filed June 7, 1930 W TNESS INVENTOR 24 J. B. Walbridge.I BY a ATTORN EY Patented Oct. 25, 1932 UNITED STATES JOHN B. WALBRIDGE,OF DREXEL HILL, PENNSYLVANIA, ASSIGNOR T0 WESTING- PATENT OFFICE HOUSEELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIATURBINE CASING Application filed June 7,

accordance with its operating conditions.

This means that patterns must be made and the complete manufacturingoperation must be carried out after an order for a turbine is received.

It is an object of my invention to provide a construction of turbinestator which comprises standardized parts from which a turbine may beconstructed for various operating conditions, so that the parts may becarried in stock and readily assembled into a turbine.

A more particular object is to provide a construction of the characterset forth involving a minimum number of parts of which a turbine statoris constructed.

In accordance with my invention, I provide a casting which includes apart of the turbine casing and one or more integral webs, for supportingthe blade carrying member, each web being of a dimension equal to themaximum dimension which may be required in the turbine. The bladecarrying members are of a regular form, and are also of the maximumaxial length which may be required. In constructing a turbine from saidparts, the blade carrying member is cut to the required size, ifnecessary. The webs are also cut to the proper dimensions, so that theinner edge meets the mainbody of the blade carrying member with thelatter in the desired axial position in the turbine. Said edge is thenwelded to the main body of the blade carrying member.

The above and other objects are efiected by my invention, as will beapparent from the following description and claims taken in connectionwith the accompanying drawing, forming a part of this application, in Vwhich:

Fig. 1 is a longitudinal, sectional view 1930. Serial No. 459,802.

through a turbine constructed in accordance with the present invention;and,

Fig. 2 is a detail sectional view showing the form of the casting ascarried in stock.

Referring now to the drawing more in detail, I show an elastic fluidturbine 10 comprising a casing 11 and a rotor 12. The casing 11 isdivided along the hori ontal plane of the turbine axis, and the upperand lower parts are formed wit-h flanges 13 at the meeting plane bymeans of which said parts may be secured together.

The casing 11 is also divided longitudinall v into three sections '14,15 and 16. The section. 16 provides the exhaust chamber and is securedto the section 15 by a conventional ,flangeand bolt joint 17. Thesections 14 and 15 are connected by a telescopic joint 18. The sectionsare also Welded to each other at 19 and 21, and a number ofradially-extending, circumferentially-distributed, pins 22 extendthrough the telescopic partsto fix the relative position of the sections14 and 15 and to transmitlongitudinal andv circumferential thrusts. 'Thepurpose of the telescoping type of joint is to permit a variation in thelength of the casing, as hereinafter explained.

The section 15 is formed with integral webs 26, 27 and 28, extendinginwardly in a direction which is at least partly radial. The webssupport blade-carrying members 29 and 30, which are secured to the websby welding the inneredgesof the we-bsto the main body of theblade-carrying members,

as indicated at 32, 33 and 34.

The-blade-carrying members are of tubular form, extending in a directionone component of which is axial, and they each carry aplnrality ofannular rows of stationary blades. The -blade-carrying members arepreferably of relatively regularform, that is, they do not haveprojections .for fitting the blade-carrying members; sothatthey may besecured atany axial point thereof to the webs, and disposed in any oneof various axial positions- The section 15 is cast and carried in stockin the form shown in Fig. 2; an additional web 25 beingprovided at theend 23 at which I In constructing a turbine for the particular steamconditions required, the blade-carrying members are reduced to thecorrect axial length, if such is less than the original maximum length.The axial position of the blade- I carrying members relative to the webssupporting the same is determined and the webs are cut at the points atwhich they meet the 'main body of the blade-carrying members, and arethen welded thereto. It will be apparent that a substantial variation isprovided in the axial position in which the bladecarrying members may bedisposed relative to the casing.

For the turbine shown in Fig. 1, the end 23 is cut at 24, removing theweb 25. The webs 26, 27 and 28 are cut at 45, 46, and 47, respectively.

The remainder of the turbine may be of any suitable construction, suchas shown on the drawing, in which the rotor is supported in bearings 41and 42, and in which the section 11 carries dummy rings 43 and thestationalry blades and nozzles of an impulse stage 44. e chamber 48formed between the webs 27 and 28 and an outlet 49 communicatingtherewith may be used for extraction of partially expanded motive fluid.

To cover a wide range of steam conditions, a number of different sizesof castings of the section 15 are provided, and each of these sizes isadapted for different operating conditions within a. limited portion ofthe total range. Different diameters of the sections 14 and 16 which fitthe different sizes of the sections 15 are provided. Each size of thesection 15 will provide for a suliicient range of different operatingconditions so that a reasonable number thereof may be carriedin stocktFrom the above description, it will be seen that I have provided aturbine stator construction which involves relatively few parts whichmay be standardized, and that the turbine stator may readily beconstructed from said standardized parts. It will be apparent that bythis construction it is possible to deliver a turbine suited for anydesired conditions in a much shorter period of time than heretofore.

imposed by the prior art or as are specifically set forth in theappended claims.

What I claim is 1. The method of assembling and constructing a turbinestator of desired capacity from standardized parts including a tubularportion made of cast metal having an integral approximately radial webportion and a separate tubular blade-carrying member, which comprisescutting the inner ed e of the web portion to a diameter fitting t eexterior of a tubular blade-carrying member of a size providing thedesired capacity, positioning the blade-carrying member in the webportion in the desired axial position relative thereto, and welding theinner edge of the web portion to the main body of the bladecarryingmember.

2. The method of manufacturing a turbine stator of desired capacity, thestator comprising intermediate and end sections for connection togetherin end-to-end relation and the intermediate section having inwardlyextending webs connected to blade rings, which comprises cutting theintermediate section to suitable length, cutting the webs to defineopenings of desired diameters, placing a blade ring or rings of desiredsize in the openings, welding the blade ring or rings to the webs, andsecuring the intermediate section to the end sections.

In testimony whereof, I have hereunto subscribed my name this 5th day ofJune, 1930.

JOHN B. WALBRIDGE.

While I have shown my invention in but one form, it will be obvious tothose skilled in the art that it is not so limited, but is susceptibleof various changes and modifications without departing from the spiritthereof, and I desire therefore, that only such limitations shall beplaced thereupon as are

